Characterizing agronomic response of rice genotypes to bacterial leaf streak disease in Uganda | IJAAR

By: Kanaabi Michael, Tusiime, Geoffrey, Tukamuhabwa, Phinehas, Zziwa, Simon, JL Andaku, Lamo, Jimmy

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Bacterial leaf streak disease (Xanthomonas Oryzae pv. Oryzicola) is a devastating disease of rice that is endemic to Asia and parts of the West African coast. In 2014, researchers in Uganda confirmed the occurrence of bacterial leaf streak disease (BLS) in the country.

Having been only recently confirmed in the country, the agronomic response of rice genotypes to the disease has not been studied and therefore the extent of damage to rice due to bacterial leaf streak disease (BLS) has not yet been estimated. A study was conducted with the objective of characterizing the agronomic response of rice genotypes with varying levels of reaction to BLS. Spray inoculation was done 30 days after planting and data collected on BLS incidence and severity starting 15 days after inoculation, then every 10 days for the next 40 days. Data were also collected on yield and yield components at maturity. A strong positive correlation (r=0.99) was found to exist between BLS AUDPC and loss in 1000 grain weight. Regression of AUDPC against yield loss was found to be highly significant (P=0.002), with a high coefficient of determination (R²-0.98). The study revealed that BLS caused yield losses of 0.8-19.2% and losses in panicle fertility of 2.1-13.6%. Source of the articles: Int. J. Agron. Agri. Res. 14(1), 1-10, January 2019.

International Journal of Agronomy and Agricultural Research - IJAAR is an open-access scholarly research journal, published by International Network for Natural Sciences. IJAAR publishes original scientific research articles in the field of Agronomy and Agricultural Sciences. IJAAR published 2 Volume and 12 issue per the calendar year.

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Pathogenicity of root-knot nematode (Meloidogyne incognita) on sweet potato (Ipomoea batatas L.) - IJAAR | International Journal of Agronomy and Agricultural Research (IJAAR)

• O.S. Osunlola*, B. Fawole

Root-knot nematode, Meloidogyne incognita, is a major biotic factor militating against sweet potato production. The pathogenicity of M. incognito on three sweet potato cultivars: Kayode, TIS 4400-2 and TIS 70357-OP-1-79 was investigated in a screen house experiment at the Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria. A vine cutting of each cultivar was planted in a 16 litre polyethylene pot containing 15 litre steam-sterilized sandy loam soil.

Three weeks after planting, the seedlings were inoculated separately at four inoculum densities: 0, 30,000, 60,000 and 90,000 eggs of M. incognito using a 3 x 4 factorial experiment replicated four times in a randomized complete block design. Data were collected on fresh shoot weight, fresh root weight, dry shoot weight, dry root weight, galling index, tuber yield, tuber quality and nematode reproduction. All data were analyzed using ANOVA (p<0.05). M. incognita significantly (p<0.05) reduced the fresh shoot weight by 16.3-23.6%, fresh root weight by 28.3-62.3%, number of tubers by 63.2-69.2% and tuber yield by 72.3-83.2%.

The gall index and the final nematode population increased with increase in inoculum density. The result showed that M incognita caused growth, yield and quality reduction in sweet potato; therefore, management of root-knot nematode should be part of sweet potato production efforts especially in areas where the nematode is endemic.

Get Full Article at:  Volume 6, Number 2, February 2015 – IJAAR

Published Journals: International Journal of Agronomy and Agricultural Research (IJAAR)

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Performance of tomato as influenced by organic manure and sowing date in Samaru, Zaria

• Mahmoud Babawuro Ali1*, Hamma Idi Lakun2, Wakili Abubakar1, Yusuf Salisu Mohammed1

1.  Federal College of Horticulture, Dadin Kowa, Nigeria
2. Samaru College of Agriculture, ABU, Zaria, Nigeria 

A field trial was conducted to study the performance of tomato as influenced by organic manure and sowing date during the 2013 dry season at the Teaching and Research Farm of Samaru College of Agriculture, Ahmadu Bello University, Zaria on the growth and yield of tomato.

Treatments consist of control, cow dung, goat manure and poultry manure and sowing date of 8th January, 2013, 22nd January, 2013, 5th February, 2013 and 19th February, 2013 dry season and laid out in a split plot design with organic manure assigned to the main plots; whereas sowing date to the sub plots with three replications.

Data were collected on growth and yield parameters; vine length, number of leaves plant-1, number of branches plant-1, leaf area plant-1, number of flowers plant-1, number of fruits plant-1, fruit weight plant-1, fruit yield plot-1 and fruit yield hectare-1. Results obtained indicated that growth and yield of tomato was lowest in control treatments which showed that the organic manure and sowing date used in the study especially poultry manure and sowing date of 5th February, 2013 promoted the yield of tomato.

Poultry manure and sowing date 5th February, 2013 enhanced tomato vine length, number of leaves plant-1, number of branches plant-1, number of flowers plant-1, number of fruits plant-1, fruit weight plant-1, fruit yield plot-1 and fruit yield hectare-1 compared to control treatments. There was no significant effect with respect to leaf area plant-1, number of fruits plant-1 and fruit weight plant-1.
Full Article available at: Volume 5, Number 5, November 2014 – IJAAR
Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)

 

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